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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a11510766b847e7971148c46a35953ff9b84b97ab960b15421eb4950bdc2fa' 
  AND token = 'mzLq1+63/6XlO224r5QP2u2Onrvjlc4i44EpGUMdMq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}